Digitization of Spörer's sunspot drawings
Digitization of Spörer's sunspot drawings
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Spörer 太阳黑子图画的数字化
DOI：
10.1017/s1743921313002214
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
C. Denker
中科院分区：
文献类型：
--
作者：
A. Diercke;R. Arlt;C. Denker
摘要我们对太阳发电机的许多认识是基于对太阳黑子的观测。因此，希望将太阳黑子的位置和形态数据集扩展到过去。古斯塔夫·施波勒在德国从安克拉姆（1861-1873）和波茨坦（1874-1894）观察。他留下了太阳黑子群的详细照片，我们对这些照片进行了数字化和处理，以减轻随着时间的推移在照片中留下的文物。经过仔细的几何校正后，太阳黑子数据现在可以作为近450个太阳自转周期的天气图。因此，可以精确地确定单个太阳黑子的位置，并使用形态学图像处理技术精确地测量黑子面积。这些方法还使我们能够确定活动区域的倾斜角（乔伊定律），并评估活动区域的复杂性。
Abstract Much of our knowledge about the solar dynamo is based on sunspot observations. It is thus desirable to extend the set of positional and morphological data of sunspots into the past. Gustav Spörer observed in Germany from Anklam (1861–1873) and Potsdam (1874–1894). He left detailed prints of sunspot groups, which we digitized and processed to mitigate artifacts left in the print by the passage of time. After careful geometrical correction, the sunspot data are now available as synoptic charts for almost 450 solar rotation periods. Individual sunspot positions can thus be precisely determined and spot areas can be accurately measured using morphological image processing techniques. These methods also allow us to determine tilt angles of active regions (Joy's law) and to assess the complexity of an active region.